Add code to trigger a scan for wifi networks

cmd/cmd.h

@@ -66,6 +66,7 @@ typedef enum {
   CMD_WIFI_SELECT_SSID,
   CMD_WIFI_SIGNAL_STRENGTH,	// Query RSSI
   CMD_WIFI_GET_SSID,		// Query SSID currently connected to
+  CMD_WIFI_START_SCAN,		// Trigger a scan (takes a long time)
 
 } CmdName;
 

cmd/handlers.c

@@ -62,6 +62,7 @@ const CmdList commands[] = {
   {CMD_WIFI_SELECT_SSID,	"WIFI_SELECT_SSID",	cmdWifiSelectSSID},
   {CMD_WIFI_SIGNAL_STRENGTH,	"WIFI_SIGNAL_STRENGTH",	cmdWifiSignalStrength},
   {CMD_WIFI_GET_SSID,		"WIFI_GET_SSID",	cmdWifiQuerySSID},
+  {CMD_WIFI_START_SCAN,		"WIFI_START_SCAN",	cmdWifiStartScan},
 
 #ifdef MQTT
   {CMD_MQTT_SETUP,      "MQTT_SETUP",     MQTTCMD_Setup},

esp-link/cgiwifi.c

@@ -227,6 +227,7 @@ static void ICACHE_FLASH_ATTR scanStartCb(void *arg) {
   wifi_station_scan(NULL, wifiScanDoneCb);
 }
 
+// Start scanning, web interface
 static int ICACHE_FLASH_ATTR cgiWiFiStartScan(HttpdConnData *connData) {
   if (connData->conn==NULL) return HTTPD_CGI_DONE; // Connection aborted. Clean up.
   jsonHeader(connData, 200);
@@ -239,6 +240,16 @@ static int ICACHE_FLASH_ATTR cgiWiFiStartScan(HttpdConnData *connData) {
   return HTTPD_CGI_DONE;
 }
 
+// Start scanning, API interface
+void ICACHE_FLASH_ATTR cmdWifiStartScan(CmdPacket *cmd) {
+  if (!cgiWifiAps.scanInProgress) {
+    cgiWifiAps.scanInProgress = 1;
+    os_timer_disarm(&scanTimer);
+    os_timer_setfn(&scanTimer, scanStartCb, NULL);
+    os_timer_arm(&scanTimer, 200, 0);
+  }
+}
+
 static int ICACHE_FLASH_ATTR cgiWiFiGetScan(HttpdConnData *connData) {
   if (connData->conn==NULL) return HTTPD_CGI_DONE; // Connection aborted. Clean up.
   char buff[1460];
@@ -955,6 +966,8 @@ void ICACHE_FLASH_ATTR wifiInit() {
 
 // Access functions for cgiWifiAps
 int ICACHE_FLASH_ATTR wifiGetApCount() {
+  if (cgiWifiAps.scanInProgress)
+    return 0;
   return cgiWifiAps.noAps;
 }
 
@@ -1002,6 +1015,6 @@ void ICACHE_FLASH_ATTR cmdWifiQuerySSID(CmdPacket *cmd) {
   os_printf("QuerySSID : %s\n", conf.ssid);
 
   cmdResponseStart(CMD_RESP_CB, callback, 1);
-  cmdResponseBody(conf.ssid, strlen(conf.ssid)+1);
+  cmdResponseBody(conf.ssid, strlen((char *)conf.ssid)+1);
   cmdResponseEnd();
 }

esp-link/cgiwifi.h

@@ -29,5 +29,6 @@ void wifiGetApName(int, char *);
 int wifiSignalStrength(int);
 void connectToNetwork(char *, char *);
 void cmdWifiQuerySSID(CmdPacket *cmd);
+void cmdWifiStartScan(CmdPacket *cmd);
 
 #endif